Seriel

Seriel - A fallen angel who taught men the signs of the moon.  However, as Sariel, he is one of the 7 archangels who stand around the throne of God.  He is sometimes equated with Uriel. [Rf. Enoch I; Ginzberg, The Legends of the Jews.]  (a)

Resource List - all entries are taken verbatim from the original source:

(a) "The Dictionary of Angels" by Gustav Davidson, © 1967